Ice Cream Challenge

People of Pythagoras
Topic: Probability, Counting & Combinatorics
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On a hot sunny day, what else to eat but ice cream? Five kids are given an opportunity to win free ice cream by solving the ice cream challenge, a simple combinatorics problem, and by gathering all the kids needed! With only an hour to do it, will they succeed?

Common Core Standards: S-CP.9
Problem #: 
102 (2013-2014)
Problem Difficulty Level: 4 [?]